Table 4. British Standard Limits and Fits BS 4500:1969
Nominal Sizes, mm
Tolerance Grades
IT 15 a
IT 16 a
Over
To
IT 01 IT 0 IT 1 IT 2 IT 3 IT 4 IT 5 IT 6 IT 7 IT 8
T 9 IT 10 IT 11 IT 12 IT 13 IT 14 a
…
3
0.3
0.5
0.8
1.2
2
3
4
6
10
14
25
40
60
100
140
250
400
600
3
6
0.4
0.6
1
1.5
2.5
4
5
8
12
18
30
48
75
120
180
300
480
750
6
10
0.4
0.6
1
1.5
2.5
4
6
9
15
22
36
58
90
150
220
360
580
900
10
18
0.5
0.8
1.2
2
3
5
8
11
18
27
43
70
110
180
270
430
700 1100
18
30
0.6
1
1.5
2.5
4
6
9
13
21
33
52
84
130
210
330
520
840 1300
30
50
0.6
1
1.5
2.5
4
7
11
16
25
39
62
100
160
250
390
620 1000 1600
50
80
0.8
1.2
2
3
5
8
13
19
30
46
74
120
190
300
460
740 1200 1900
80
120
1
1.5
2.5
4
6
10
15
22
35
54
87
140
220
350
540
870 1400 2200
120
180
1.2
2
3.5
5
8
12
18
25
40
63
100
160
250
400
630 1000 1600 2500
180
250
2
3
4.5
7
10
14
20
29
46
72
115
185
290
460
720 1150 1850 2900
250
315
2.5
4
6
8
12
16
23
32
52
81
130
210
320
520
810 1300 2100 3200
315
400
3
5
7
9
13
18
25
36
57
89
140
230
360
570
890 1400 2300 3600
400
500
4
6
8
10
15
20
27
40
63
97
155
250
400
630
970 1550 2500 4000
a Not applicable to sizes below 1 mm. The dimensions are given in 0.001 mm, except for the nominal sizes, which are in millimeters.
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